Pub Date : 2005-04-04DOI: 10.1109/INTMAG.2005.1463748
M. Okuda, S. Das, T. Kobayashi, S. Nakagawa
The perpendicular magnetization characteristics of Gd/sub x/(Fe/sub 90/Co/sub 10/)/sub 1-x/ and Tb/sub x/(Fe/sub 90/Co/sub 10/)/sub 1-x/ around their compensation point was measured by the ferromagnetic Hall measurement since the Hall measurement has a sufficient sensitivity to observe magnetization characteristics of very thin films with low saturation magnetization. Gd/sub x/(Fe/sub 90/Co/sub 10/)/sub 1-x/ thin films were deposited by ion beam sputtering using either Ar or Kr gas to investigate the effects of recoiled particles. Ion irradiation effects were also investigated using dual ion beam sputtering technique.
{"title":"Recoiled particle irradiation effects to RE-TM films around compensation point observed by ferromagnetic Hall effect","authors":"M. Okuda, S. Das, T. Kobayashi, S. Nakagawa","doi":"10.1109/INTMAG.2005.1463748","DOIUrl":"https://doi.org/10.1109/INTMAG.2005.1463748","url":null,"abstract":"The perpendicular magnetization characteristics of Gd/sub x/(Fe/sub 90/Co/sub 10/)/sub 1-x/ and Tb/sub x/(Fe/sub 90/Co/sub 10/)/sub 1-x/ around their compensation point was measured by the ferromagnetic Hall measurement since the Hall measurement has a sufficient sensitivity to observe magnetization characteristics of very thin films with low saturation magnetization. Gd/sub x/(Fe/sub 90/Co/sub 10/)/sub 1-x/ thin films were deposited by ion beam sputtering using either Ar or Kr gas to investigate the effects of recoiled particles. Ion irradiation effects were also investigated using dual ion beam sputtering technique.","PeriodicalId":273174,"journal":{"name":"INTERMAG Asia 2005. Digests of the IEEE International Magnetics Conference, 2005.","volume":"6 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2005-04-04","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"114774627","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
Pub Date : 2005-04-04DOI: 10.1109/INTMAG.2005.1463850
N. Shimomura, T. Kishi, M. Yoshikawa, E. Kitagawa, Y. Asao, H. Hada, H. Yoda, S. Tahara
The switching characteristic of the MTJ (magnetic tunnel junction) submicron pattern is investigated. The mechanism of the step in the M-H loop analyzed. In the M-H loop of the MTJ, which has a C-type domain, a step is created by pinning of the 360-degree domain wall, which is caused by the stray field originated in the pinned layer. The position of the steps in the M-H loops is dependent on the direction of the stray field from the pinned layer. The model explains the steps in the M-H loops obtained from the experiment.
{"title":"Edge domain dependent pinning effect by the stray field in the patterned magnetic tunnel junction","authors":"N. Shimomura, T. Kishi, M. Yoshikawa, E. Kitagawa, Y. Asao, H. Hada, H. Yoda, S. Tahara","doi":"10.1109/INTMAG.2005.1463850","DOIUrl":"https://doi.org/10.1109/INTMAG.2005.1463850","url":null,"abstract":"The switching characteristic of the MTJ (magnetic tunnel junction) submicron pattern is investigated. The mechanism of the step in the M-H loop analyzed. In the M-H loop of the MTJ, which has a C-type domain, a step is created by pinning of the 360-degree domain wall, which is caused by the stray field originated in the pinned layer. The position of the steps in the M-H loops is dependent on the direction of the stray field from the pinned layer. The model explains the steps in the M-H loops obtained from the experiment.","PeriodicalId":273174,"journal":{"name":"INTERMAG Asia 2005. Digests of the IEEE International Magnetics Conference, 2005.","volume":"123 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2005-04-04","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"114798565","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
Pub Date : 2005-04-04DOI: 10.1109/INTMAG.2005.1463501
K. Yagami, A. Tulapurkar, A. Fukushima, Y. Suzuki
Low-temperature measurements of spin-transfer magnetization switching are carried out. The extrapolated critical currents at /spl tau/=0 K (I/sub c//sup 0K/) are then compared with that at /spl tau/=/spl tau//sub 0/ (I/sub c0/) as well as with switching currents measured by ns-pulsed currents. To estimate currents for nano-second writing where no thermal switching happens, I/sub c//sup 0K/, not I/sub c0/, must be known since I/sub c0/ has temperature dependence.
{"title":"Inspection of intrinsic critical currents for spin-transfer magnetization switching by low-temperature measurements","authors":"K. Yagami, A. Tulapurkar, A. Fukushima, Y. Suzuki","doi":"10.1109/INTMAG.2005.1463501","DOIUrl":"https://doi.org/10.1109/INTMAG.2005.1463501","url":null,"abstract":"Low-temperature measurements of spin-transfer magnetization switching are carried out. The extrapolated critical currents at /spl tau/=0 K (I/sub c//sup 0K/) are then compared with that at /spl tau/=/spl tau//sub 0/ (I/sub c0/) as well as with switching currents measured by ns-pulsed currents. To estimate currents for nano-second writing where no thermal switching happens, I/sub c//sup 0K/, not I/sub c0/, must be known since I/sub c0/ has temperature dependence.","PeriodicalId":273174,"journal":{"name":"INTERMAG Asia 2005. Digests of the IEEE International Magnetics Conference, 2005.","volume":"62 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2005-04-04","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"114648755","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
Pub Date : 2005-04-04DOI: 10.1109/INTMAG.2005.1463971
P. Luk, T. El-Hasan
The generator under investigation is a single phase with an output of 20 kVA at 60 krpm. It has a modular structure, that facilitates multistage and multiphase arrangement, making it easy to extent to a 3-phase generator with three fold output. The half cross section of the generator is shown with the back-iron assembly (only one rotor disc is shown for clarity). In the current work, the selection of material and the profiling of the geometry of the back-iron, are considered to be the key parameters for optimization. The essence of the proposed design methodology rests on the development of an efficient ANSYS-based 3D finite element model of the generator that facilitates iterative magnetic performance predication and mechanical stress analysis.
{"title":"Integrated design for a high speed permanent magnet axial flux generator","authors":"P. Luk, T. El-Hasan","doi":"10.1109/INTMAG.2005.1463971","DOIUrl":"https://doi.org/10.1109/INTMAG.2005.1463971","url":null,"abstract":"The generator under investigation is a single phase with an output of 20 kVA at 60 krpm. It has a modular structure, that facilitates multistage and multiphase arrangement, making it easy to extent to a 3-phase generator with three fold output. The half cross section of the generator is shown with the back-iron assembly (only one rotor disc is shown for clarity). In the current work, the selection of material and the profiling of the geometry of the back-iron, are considered to be the key parameters for optimization. The essence of the proposed design methodology rests on the development of an efficient ANSYS-based 3D finite element model of the generator that facilitates iterative magnetic performance predication and mechanical stress analysis.","PeriodicalId":273174,"journal":{"name":"INTERMAG Asia 2005. Digests of the IEEE International Magnetics Conference, 2005.","volume":"111 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2005-04-04","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"114963508","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
Pub Date : 2005-04-04DOI: 10.1109/INTMAG.2005.1464314
Ki Hyeon Kim, Yung-Am Kim, M. Yamaguchi
In radio frequency (RF) fields, the applications of the loss generation of ferromagnetic thin films are one of good countermeasure for the suppression of electromagnetic (EM) noise emission on transmission line. In this study, to reduce the eddy current loss due to the separation magnetic materials by carbon nanotube, we evaluated the RF EM noise suppression using the sheet typed Fe filled in carbon nanotube (CNT) and epoxy composite sheet on the coplanar transmission line in comparison with that of ferrite film.
{"title":"Characteristics of RF noise suppressor using Fe filled in carbon nanotube","authors":"Ki Hyeon Kim, Yung-Am Kim, M. Yamaguchi","doi":"10.1109/INTMAG.2005.1464314","DOIUrl":"https://doi.org/10.1109/INTMAG.2005.1464314","url":null,"abstract":"In radio frequency (RF) fields, the applications of the loss generation of ferromagnetic thin films are one of good countermeasure for the suppression of electromagnetic (EM) noise emission on transmission line. In this study, to reduce the eddy current loss due to the separation magnetic materials by carbon nanotube, we evaluated the RF EM noise suppression using the sheet typed Fe filled in carbon nanotube (CNT) and epoxy composite sheet on the coplanar transmission line in comparison with that of ferrite film.","PeriodicalId":273174,"journal":{"name":"INTERMAG Asia 2005. Digests of the IEEE International Magnetics Conference, 2005.","volume":"26 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2005-04-04","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"115024689","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
Pub Date : 2005-04-04DOI: 10.1109/INTMAG.2005.1463918
Y. Kurihara, M.Z. Ahmde, H. Osawa, Y. Okamoto
In high density perpendicular recording the reduction techniques of the inter-track interference is important. In this paper, we investigate a new CITI code based on the equalized level of class-1 partial response (PR1), which is the simplest PR system whose polynomial is represented by only positive coefficients. The constructive inter-track interference code for the PR1 equalization in perpendicular recording was discussed. The results show that the proposed system exhibits better BER performance than the conventional one.
{"title":"CITI code based on PR1 equalized level for perpendicular recording","authors":"Y. Kurihara, M.Z. Ahmde, H. Osawa, Y. Okamoto","doi":"10.1109/INTMAG.2005.1463918","DOIUrl":"https://doi.org/10.1109/INTMAG.2005.1463918","url":null,"abstract":"In high density perpendicular recording the reduction techniques of the inter-track interference is important. In this paper, we investigate a new CITI code based on the equalized level of class-1 partial response (PR1), which is the simplest PR system whose polynomial is represented by only positive coefficients. The constructive inter-track interference code for the PR1 equalization in perpendicular recording was discussed. The results show that the proposed system exhibits better BER performance than the conventional one.","PeriodicalId":273174,"journal":{"name":"INTERMAG Asia 2005. Digests of the IEEE International Magnetics Conference, 2005.","volume":"116 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2005-04-04","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"117135907","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
Pub Date : 2005-04-04DOI: 10.1109/INTMAG.2005.1463489
C. Du, G. Guo, J. Zhang
Dual-stage servos with multiple milli or micro actuators are proposed as an effective way to increase the servo performance for higher track density of hard disk drives (HDDs) at high rotational speed. In this work, we mainly deal with the interaction problem between the micro actuators, which is formulated based on its influence on the positioning accuracy.
{"title":"Interaction decoupling control of multiple milliactuators in dual-stage servos","authors":"C. Du, G. Guo, J. Zhang","doi":"10.1109/INTMAG.2005.1463489","DOIUrl":"https://doi.org/10.1109/INTMAG.2005.1463489","url":null,"abstract":"Dual-stage servos with multiple milli or micro actuators are proposed as an effective way to increase the servo performance for higher track density of hard disk drives (HDDs) at high rotational speed. In this work, we mainly deal with the interaction problem between the micro actuators, which is formulated based on its influence on the positioning accuracy.","PeriodicalId":273174,"journal":{"name":"INTERMAG Asia 2005. Digests of the IEEE International Magnetics Conference, 2005.","volume":"37 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2005-04-04","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"116320686","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
Pub Date : 2005-04-04DOI: 10.1109/INTMAG.2005.1463915
T. Ueno, T. Higuchi
A high sensitive and heat-resistive magnetic displacement sensor using a magnetostrictive/piezoelectric laminate composite is introduced. Two types of sensor are fabricated by a laminate composite of Tb-Dy-Fe (T/sub c/: 380/spl deg/C) alloy and LiNbO/sub 3/ (T/sub c/: 1200/spl deg/C) or PZT (T/sub c/: 340/spl deg/C) integrated to a magnetic circuit consisting of iron yokes and a SmCo magnet (T/sub c/: 830/spl deg/C). The temperature characteristics of sensitivity is measured. The results demonstrate heat-resistivity of the sensor inherited from the high Curie temperatures of Tb-Dy-Fe and LiNbO/sub 3/.
{"title":"High sensitive and heat-resistive magnetic displacement sensor using magnetorestrictive/piezoelectric laminate composite","authors":"T. Ueno, T. Higuchi","doi":"10.1109/INTMAG.2005.1463915","DOIUrl":"https://doi.org/10.1109/INTMAG.2005.1463915","url":null,"abstract":"A high sensitive and heat-resistive magnetic displacement sensor using a magnetostrictive/piezoelectric laminate composite is introduced. Two types of sensor are fabricated by a laminate composite of Tb-Dy-Fe (T/sub c/: 380/spl deg/C) alloy and LiNbO/sub 3/ (T/sub c/: 1200/spl deg/C) or PZT (T/sub c/: 340/spl deg/C) integrated to a magnetic circuit consisting of iron yokes and a SmCo magnet (T/sub c/: 830/spl deg/C). The temperature characteristics of sensitivity is measured. The results demonstrate heat-resistivity of the sensor inherited from the high Curie temperatures of Tb-Dy-Fe and LiNbO/sub 3/.","PeriodicalId":273174,"journal":{"name":"INTERMAG Asia 2005. Digests of the IEEE International Magnetics Conference, 2005.","volume":"39 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2005-04-04","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"116485998","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
Pub Date : 2005-04-04DOI: 10.1109/INTMAG.2005.1463826
R. Shimazu, M. Tada, N. Matsushita, H. Handa, M. Abe
In this study a mm-sized high-efficiency magnetic separator using Ni wires as the field gradient enhancing bodies was developed. This enables the use of bioactive beads having a few nm or smaller size that cannot be separated by a conventional magnetic separation technique. This will improve efficiency of bio-sensing much, because the smaller the beads, the larger the specific surface area, and thus the greater the number of bioactive molecules fixed on their surfaces. The developed magnetic separators are applicable to robot-manipulated bio-sensing systems.
{"title":"Expediting magnetic separation by using Ni wires for robot-manipulated bio-sensing system","authors":"R. Shimazu, M. Tada, N. Matsushita, H. Handa, M. Abe","doi":"10.1109/INTMAG.2005.1463826","DOIUrl":"https://doi.org/10.1109/INTMAG.2005.1463826","url":null,"abstract":"In this study a mm-sized high-efficiency magnetic separator using Ni wires as the field gradient enhancing bodies was developed. This enables the use of bioactive beads having a few nm or smaller size that cannot be separated by a conventional magnetic separation technique. This will improve efficiency of bio-sensing much, because the smaller the beads, the larger the specific surface area, and thus the greater the number of bioactive molecules fixed on their surfaces. The developed magnetic separators are applicable to robot-manipulated bio-sensing systems.","PeriodicalId":273174,"journal":{"name":"INTERMAG Asia 2005. Digests of the IEEE International Magnetics Conference, 2005.","volume":"76 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2005-04-04","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"124883558","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
D. Djayaprawira, K. Tsunekawa, M. Nagai, H. Maehara, S. Yamagata, N. Watanabe, S. Yuasa, K. Ando
The magnetoresistance ratio of 230% at room temperature is reported. This was achieved in spin-valve type magnetic tunnel junctions using MgO barrier layer and amorphous CoFeB ferromagnetic electrodes fabricated on thermally oxidized Si substrates. The amorphous CoFeB electrodes are of great advantage to the polycrystalline FeCo electrodes in achieving a high homogeneity in small 100 nm-sized MTJs.
{"title":"230% room temperature magnetoresistance in CoFeB/MgO/CoFeB magnetic tunnel junctions","authors":"D. Djayaprawira, K. Tsunekawa, M. Nagai, H. Maehara, S. Yamagata, N. Watanabe, S. Yuasa, K. Ando","doi":"10.1063/1.1871344","DOIUrl":"https://doi.org/10.1063/1.1871344","url":null,"abstract":"The magnetoresistance ratio of 230% at room temperature is reported. This was achieved in spin-valve type magnetic tunnel junctions using MgO barrier layer and amorphous CoFeB ferromagnetic electrodes fabricated on thermally oxidized Si substrates. The amorphous CoFeB electrodes are of great advantage to the polycrystalline FeCo electrodes in achieving a high homogeneity in small 100 nm-sized MTJs.","PeriodicalId":273174,"journal":{"name":"INTERMAG Asia 2005. Digests of the IEEE International Magnetics Conference, 2005.","volume":"43 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2005-04-04","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"125047827","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
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